Is there a way to convert a Nurbs curve to Bezier?
Under Edit Mode in the Tools tab of the Tool Shelf there is a button labeled Set Spline Type to switch between several curve types like Poly, Bezier or NURBS.



Under 2.8+ this can be set from the 3D View header menu > Curve > Set Spline Type.



Spline type is stored as a per-curve spline property. A spline is any connected sequence of vertex in Edit Mode within a single curve object, that means each  different spline within a curve can have its own independent type.